Simple optimization

nsure that delete works not only on table->record[0] for federated tables


sql/field.cc:
  Test OOM condition
sql/ha_federated.cc:
  Simple optimizations
  Ensure that delete works not only on table->record[0]
sql/opt_range.cc:
  Simplify code

sql/field.cc

@@ -6822,7 +6822,12 @@ int Field_blob::store(const char *from,uint length,CHARSET_INFO *cs)
 						  &not_used)))
     { 
       uint conv_errors;
-      tmpstr.copy(from, length, cs, field_charset, &conv_errors);
+      if (tmpstr.copy(from, length, cs, field_charset, &conv_errors))
+      {
+        /* Fatal OOM error */
+        bzero(ptr,Field_blob::pack_length());
+        return -1;
+      }
       from= tmpstr.ptr();
       length=  tmpstr.length();
       if (conv_errors)

sql/ha_federated.cc

@@ -1399,27 +1399,25 @@ int ha_federated::update_row(const byte *old_data, byte *new_data)
 
 int ha_federated::delete_row(const byte *buf)
 {
-  uint x= 0;
   char delete_buffer[IO_SIZE];
   char data_buffer[IO_SIZE];
-
   String delete_string(delete_buffer, sizeof(delete_buffer), &my_charset_bin);
-  delete_string.length(0);
   String data_string(data_buffer, sizeof(data_buffer), &my_charset_bin);
-  data_string.length(0);
-
   DBUG_ENTER("ha_federated::delete_row");
 
+  delete_string.length(0);
   delete_string.append("DELETE FROM `");
   delete_string.append(share->table_base_name);
   delete_string.append("`");
   delete_string.append(" WHERE ");
 
-  for (Field **field= table->field; *field; field++, x++)
+  for (Field **field= table->field; *field; field++)
   {
-    delete_string.append((*field)->field_name);
+    Field *cur_field= *field;
+    data_string.length(0);
+    delete_string.append(cur_field->field_name);
 
-    if ((*field)->is_null())
+    if (cur_field->is_null_in_record((const uchar*) buf))
     {
       delete_string.append(" IS ");
       data_string.append("NULL");
@@ -1427,17 +1425,15 @@ int ha_federated::delete_row(const byte *buf)
     else
     {
       delete_string.append("=");
-      (*field)->val_str(&data_string);
-      (*field)->quote_data(&data_string);
+      cur_field->val_str(&data_string, (char*) buf+ cur_field->offset());
+      cur_field->quote_data(&data_string);
     }
 
     delete_string.append(data_string);
-    data_string.length(0);
-
-    if (x + 1 < table->s->fields)
     delete_string.append(" AND ");
   }
 
+  delete_string.length(delete_string.length()-5); // Remove AND
   delete_string.append(" LIMIT 1");
   DBUG_PRINT("info",
              ("Delete sql: %s", delete_string.c_ptr_quick()));

sql/opt_range.cc

@@ -8556,23 +8556,21 @@ int QUICK_GROUP_MIN_MAX_SELECT::next_max_in_range()
 
     if ((result == HA_ERR_KEY_NOT_FOUND) && (cur_range->flag & EQ_RANGE))
       continue; /* Check the next range. */
-    else if (result)
+    if (result)
+    {
       /*
         In no key was found with this upper bound, there certainly are no keys
         in the ranges to the left.
       */
       return result;
-
+    }
     /* A key was found. */
     if (cur_range->flag & EQ_RANGE)
-      return result; /* No need to perform the checks below for equal keys. */
+      return 0; /* No need to perform the checks below for equal keys. */
 
     /* Check if record belongs to the current group. */
     if (key_cmp(index_info->key_part, group_prefix, real_prefix_len))
-    {
-      result = HA_ERR_KEY_NOT_FOUND;
-      continue;
-    }
+      continue;                                 // Row not found
 
     /* If there is a lower limit, check if the found key is in the range. */
     if ( !(cur_range->flag & NO_MIN_RANGE) )